1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/string.h>
3 #include <linux/kernel.h>
4 #include <linux/export.h>
5 #include <linux/mod_devicetable.h>
6 #include <linux/errno.h>
7 #include <linux/irq.h>
8 #include <linux/of.h>
9 #include <linux/of_platform.h>
10 #include <linux/of_address.h>
11 #include <linux/of_irq.h>
12 #include <linux/platform_device.h>
13 
14 #include "of_device_common.h"
15 
16 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
17 {
18 	struct platform_device *op = of_find_device_by_node(node);
19 
20 	if (!op || index >= op->archdata.num_irqs)
21 		return 0;
22 
23 	return op->archdata.irqs[index];
24 }
25 EXPORT_SYMBOL(irq_of_parse_and_map);
26 
27 int of_address_to_resource(struct device_node *node, int index,
28 			   struct resource *r)
29 {
30 	struct platform_device *op = of_find_device_by_node(node);
31 
32 	if (!op || index >= op->num_resources)
33 		return -EINVAL;
34 
35 	memcpy(r, &op->archdata.resource[index], sizeof(*r));
36 	return 0;
37 }
38 EXPORT_SYMBOL_GPL(of_address_to_resource);
39 
40 void __iomem *of_iomap(struct device_node *node, int index)
41 {
42 	struct platform_device *op = of_find_device_by_node(node);
43 	struct resource *r;
44 
45 	if (!op || index >= op->num_resources)
46 		return NULL;
47 
48 	r = &op->archdata.resource[index];
49 
50 	return of_ioremap(r, 0, resource_size(r), (char *) r->name);
51 }
52 EXPORT_SYMBOL(of_iomap);
53 
54 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
55  * BUS and propagate to all child platform_device objects.
56  */
57 void of_propagate_archdata(struct platform_device *bus)
58 {
59 	struct dev_archdata *bus_sd = &bus->dev.archdata;
60 	struct device_node *bus_dp = bus->dev.of_node;
61 	struct device_node *dp;
62 
63 	for (dp = bus_dp->child; dp; dp = dp->sibling) {
64 		struct platform_device *op = of_find_device_by_node(dp);
65 
66 		op->dev.archdata.iommu = bus_sd->iommu;
67 		op->dev.archdata.stc = bus_sd->stc;
68 		op->dev.archdata.host_controller = bus_sd->host_controller;
69 		op->dev.archdata.numa_node = bus_sd->numa_node;
70 		op->dev.dma_ops = bus->dev.dma_ops;
71 
72 		if (dp->child)
73 			of_propagate_archdata(op);
74 	}
75 }
76 
77 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
78 {
79 	if (addrc)
80 		*addrc = of_n_addr_cells(dp);
81 	if (sizec)
82 		*sizec = of_n_size_cells(dp);
83 }
84 
85 /*
86  * Default translator (generic bus)
87  */
88 
89 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
90 {
91 	get_cells(dev, addrc, sizec);
92 }
93 
94 /* Make sure the least significant 64-bits are in-range.  Even
95  * for 3 or 4 cell values it is a good enough approximation.
96  */
97 int of_out_of_range(const u32 *addr, const u32 *base,
98 		    const u32 *size, int na, int ns)
99 {
100 	u64 a = of_read_addr(addr, na);
101 	u64 b = of_read_addr(base, na);
102 
103 	if (a < b)
104 		return 1;
105 
106 	b += of_read_addr(size, ns);
107 	if (a >= b)
108 		return 1;
109 
110 	return 0;
111 }
112 
113 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
114 {
115 	u32 result[OF_MAX_ADDR_CELLS];
116 	int i;
117 
118 	if (ns > 2) {
119 		printk("of_device: Cannot handle size cells (%d) > 2.", ns);
120 		return -EINVAL;
121 	}
122 
123 	if (of_out_of_range(addr, range, range + na + pna, na, ns))
124 		return -EINVAL;
125 
126 	/* Start with the parent range base.  */
127 	memcpy(result, range + na, pna * 4);
128 
129 	/* Add in the child address offset.  */
130 	for (i = 0; i < na; i++)
131 		result[pna - 1 - i] +=
132 			(addr[na - 1 - i] -
133 			 range[na - 1 - i]);
134 
135 	memcpy(addr, result, pna * 4);
136 
137 	return 0;
138 }
139 
140 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
141 {
142 	if (flags)
143 		return flags;
144 	return IORESOURCE_MEM;
145 }
146 
147 /*
148  * SBUS bus specific translator
149  */
150 
151 int of_bus_sbus_match(struct device_node *np)
152 {
153 	struct device_node *dp = np;
154 
155 	while (dp) {
156 		if (of_node_name_eq(dp, "sbus") ||
157 		    of_node_name_eq(dp, "sbi"))
158 			return 1;
159 
160 		/* Have a look at use_1to1_mapping().  We're trying
161 		 * to match SBUS if that's the top-level bus and we
162 		 * don't have some intervening real bus that provides
163 		 * ranges based translations.
164 		 */
165 		if (of_property_present(dp, "ranges"))
166 			break;
167 
168 		dp = dp->parent;
169 	}
170 
171 	return 0;
172 }
173 
174 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
175 {
176 	if (addrc)
177 		*addrc = 2;
178 	if (sizec)
179 		*sizec = 1;
180 }
181